American security and Iraqi stability depend on a prompt handover. From childhood, we Americans are deluged with slogans. We often select our breakfast food, our soap, and our toothpaste by jingles and catchphrases rather than by reading the labels. So we fall easily into accepting evocative expressions in place of analysis even when it comes to national security. Our parents were sold on the slogan that the First World War was the "war to end all wars," although the 20th century had more of them than any other in history. We went into Vietnam fearing the "domino effect," although the...